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1. Visit https://reviews.facebook.net and connect your existing github or Facebook account there.
2. The Phabricator command-line tool arc requires a PHP interpreter available on your development machine.  If you can run the command php --version, you already have it.  If not, google for "php command line" to see how to install it for your system.
3. Next, install arc. If you follow the //www.phabricator.com/docs/phabricator/article/Arcanist_Quick_Start.html, only the first section ("Install Arcanist") is applicable.
4. Run ant arc-setup to install an extra module needed for JIRA integration.  (This ant target was added with the commit of HIVE-2486.)
5. In your Hive checkout (either git or svn), run arc install-certificate and follow the instructions given.

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git checkout this particular tag in your libphutil repository:

git checkout 870bcc76434410344d27a3fa4604ac96200bf7f6

2. If you run into an error like this error with Arcanist:

Call to undefined method ArcanistGitAPI parseRelativeLocalCommit()
Failed to load symbol ...

Checkout this tag for arcanist:

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